Tracker.autorun not re-running in componentWillMount()

I have a query to a Mongo collection inside the componentWillMount function of a React component, like this:

componentWillMount() {

        Tracker.autorun(() => {
            var data = SomeColl.find({}).fetch();

but the Tracker.autorun function does not run when the data changes, hence data does change form being undefined. Any ideas?

You subscribe ‘SomePug’, but you do the find in SomeColl. Have you subscribe it before?

Use createContainer instead

Thanks for the suggestion, but I am hoping to avoid using createContainer in favour of a more React-centric method.